Double-acting band-brake.



y Patented Nov. l2, |901. H. A. TuTTLE. DOUBLE ACTING BAND BRAKE.

(Application led Dec. 18, 1900.)

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No. 686,429. Patented Nov. l2, |90I.

H. A. TUTTLE. OUBLE ACTING BAND BRAKE.

(Application filed Dec. 18, 1900.) (No Model.) 2 Sheets-Sheet 2.

WITNESSES. INVENTOR.

UNrTED STATES PATENT OFFICE.

HENRY A. TUTTLE, OF STAMFORD, CONNECTICT.

DOUBLE-ACTING BAN D-BRAKE.

SPECIFICATION forming part of Letters Patent No. 686,429, dated November 12, 1901.

Application iled December 18, 1900. Serial No. 40,296. (No model.)

gasolene, or electrically propelled, to stop the` Vehicle at any time and under all conditions and to hold it absolutely rigidly against movement in either direction, it being required, moreover, that the device be quick-acting both in setting and releasing, perfectly safe, and reliable under all conditions of temperature and weather. By that I mean that it v will hold a vehicle against forward or backward movement on a steep grade in cold weather as Well as in warm weather and under the varying conditions of rain, snow, and ice, and it being, furthermore, required that the device be relatively inexpensive to produce, thoroughly durable, and practically impossible to get out of repair With the above ends in view I have devised the simple and novel double-acting bandbrake which I will now describe, referring to the accompanying drawings, forming part of this specification, and using reference characters to designate the several parts.

Figure 1 is a side elevation of my novel brake complete, the parts being in the released position; Fig. 2, a view as seen from the right in Figs. l and 3; Fig. 3, a section on the line 3 3 in Fig. 2, the parts being in the set position; Fig. 4, a view as seen from the right in Figs. 1 and 3, the frame or carrier being omitted; and Fig. 5 is a view corresponding With Fig. l, illustrating a form of my invention in which releasing-springs are not used and also illustrating slight changes in details of construction.

.A denotes an axle; B, a friction-wheel carried thereby; C, a brake frame or carrier, and D a guide through which a portion of the frame or carrier passes. It should be understood that the shape, design, and arrangement of the frame or carrier and the guide are matters of no importance whatever so far as the principle of my invention is concerned, Vthe sole requirement being that the operative parts of the device be supported by a suitable structure.

2O denotes a strap, which may or may not be made of metal and may or may not carry a shoe 2l. This strap partly incloses the friction-wheel and, assuming that it is made of metal, is provided with reduced ends, which pass through the frame and through levers 22 and 23, respectively, the ends being secured in place by nuts 24. The frame or carrier also may or may not be provided with a shoe 2l. For convenience I term both the strap and the frame braking surfaces. The outer ends of levers 22 and 23 are pivoted vto the frame, as at 25, and the inner ends are pivoted, as at 26, to a yoke 27. The yoke may be directly connected to an operating-rod 28, as in Figs. l to 3,inclusive, or the operatingrod may be connected to a bell-crank lever 29, as inFig. 5, the yoke in this form being shown as connected to the bell-crank lever by means of a link 30.

31 denotes lips which may be provided beth on the strap and the frame to partly inclose shoes 2l and the rim of the friction-wheel to insure the retention of the parts in place under the varying conditions of use.

'32 denotes releasing-springs which may or may not be used to assist or to hasten the release when the power is relieved after setting the brake. These springs are carried, respectively, by the strap and the frame, both of said parts and the corresponding shoes being shown as provided with openings 33. The releasing-springs may be so shaped that the ends thereof will pass through these openings and bear upon the periphery of the frictionwheel when in the set position or arepreferably, as shown in Figs. 1 to 4, inclusive, provided With rollers 34, which are adapted to pass through the openings and bear upon the periphery of the friction-wheel, so as to prevent any friction of the spring thereon, it being obvious that the instant the pressure which has been applied to move the frame and the strap toward each other and toward IOO the friction-wheel to set the brake is relieved the springs will act to move the frame, strap, and shoes outward away from each other and away from the friction-wheel, thereby instantly relieving the braking action thereon.

The operation of setting and releasing the brake is as follows: Suppose the parts to be in the released position, as in Figs. l and 5. A pull upon the operating-rod moves levers 22 and 23 from the position indicated by dotted lines in Fig. l toward the position clearly shown in Fig. 3, the primary effect of which is to draw the strap inward toward the friction-wheel. The instant this movement commences, however, levers 22 and 23 become levers of the second class, the connections to the frame being the fulcrums, the connections of the ends of the strap to the levers being the resistance, and the operating-rod, of course, the power. As the frame or carrier is movable relatively to the friction-wheel, it follows that the levers instantly become doubleacting, so that the frame is moved toward the friction-wheel from one direction with precisely the same power that the strap is moved toward it from the opposite direction, the effect being that the friction-wheel is clamped between two oppositely-moving braking-surfaces with equal power. It will be obvious that any required amount of power may be applied to the levers and that it is a matter of not the slightest consequence, so far as the action of the brake is concerned, in which direction the friction-wheel may be turning. I have found in practice in various uses to which this brake has been applied that it is safe and practically instantaneous in action under all circumstances.

As shown in the drawings, the levers 22 and 23 are connected .together at their adjacent ends and extend therefrom in opposite directions and at their outer ends bear upon the frame at 25. The operating-rod which is connected to the meeting ends of the two levers enables the pull which sets the braking-surfaces to be exerted in a direction radial to the friction-wheel. This construction enables the entire frame to be carried entirely unsupported by any other means than the frictionwheel itself, for the reason that the operating movement is in such radial direction and not tangential to the wheel. This is particularly desirable in such structures as motor-vehicles, where it is dicult or undesirable to provide any supporting attachment for the braking mechanism.

Having thus described my invention, I claiml. A machine-brake comprising a frictionwheel, braking members having braking-surfaces diametrically opposed to each other and carried by a frame supported by the frictionwheel and means for applying power in a direction radial to the friction-wheel for moving both braking-surfaces directly toward the center of the friction-wheel simultaneously and with equal power.

2. A machine-brake comprising a frictionwheel, braking members having braking-surfaces diametrically opposed to each other and carried by a frame supported by the frictionwheel, means for applying power in a direction radial to the friction-wheel for moving both braking-surfaces directly toward the center of the friction-wheel simultaneously and with equal power, and means for moving the braking surfaces away from the frictionwheel the instant the power is relieved.

3. A machine-brake comprising a frictionwheel, a movable frame supported thereby and adapted to act as a brake, a braking-surface adapted to act diametrically opposite thereto, levers connected together and extending in opposite directions from their point of connection and bearing upon the frame and a strap by which the brakingsurface is carried and the ends of which are connected to the levers between their bearing-points and their points of connection, whereby outward movement of the levers will simultaneously draw the strap and press the frame toward the friction-wheel from diametrically opposite directions and with equal power.

4. In combination, a friction-wheel, a movable frame adapted to act as a brake therefor, levers bearing against the frame, a strap partly inclosing the friction-wheel and adapted to act as a brake therefor, the ends of said strap being connected to the levers respectively, and said strap and said frame being provided with openings 33, and springs carried by the strap and frame respectively and acting through said openings upon the friction-wheel when the parts are in the set position to move the strap and the frame away from the friction-wheel as soon as the power is relieved.

5. The combination with a friction-wheel, a movable frame adapted to act as abrake, a braking-surface adapted to act diametrically opposite thereto and levers bearing against the frame, of a strap by which the brakingsurface is carried and the ends of which are connected to the levers respectively, and means for operating said levers to move the braking-surface and frame toward the friction-wheel from diametrically opposite directions and with equal power.

6. The combination with a friction-wheel and a frame adapted to act as a brake therefor, of levers bearing against the frame, a strap partly inclosing the friction-wheel and adapted to act as a brake therefor, said frame and said strap being provided with openings 33 and the ends of the strap being connected to the levers respectively, and releasingsprings carried by the frame and the strap respectively and carrying-rollers lying in the openings,substantially as and for the purpose set forth.

IOO

IIO

'7. The combination with a friction-wheel and a frame adapted to act as a brake therefor, 0f leVers bearing equally against the frame, a strap partly inclosing the frictionwheel and adapted to actas a brake therefor, the ends of said strap being connected to the levers respeetively,brakeshoes on said frame and said strap diametrically opposite to each other and lips on said frame and said strap partly inelosing the brake-shoes and the pero riphery of the friction-wheel, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

HENRY A. TUTTLE. Witnesses:

WM. F. WATERBURY, F. B. GURLEY. 

